S/C switch No. 2 signal circuit shorted to voltage or open between PCM and clockspring

S/C switch No. 2 signal circuit is open between the clockspring and S/C switch

S/C switch return circuit is open between PCM and clockspring or S/C switch

S/C switch No. 2 or clockspring has failed

PCM has failed

Trouble Code: P0594

Speed Control Servo Power Circuit Malfunction

Possible Causes:

S/C solenoid or vent solenoid has failed

Brake switch is damaged or it has failed

S/C brake switch circuit is open or it is shorted to ground

S/C power circuit is open or it is shorted to ground

PCM has failed

Trouble Code: P0600

PCM Internal Failure, No SPI Communications

Possible Causes:

Turn the key off. Remove the PCM connector(s) and inspect the wiring harness connector pins and PCM pins for damaged, bent or missing pins. If any problems are located, make the repair and then perform the PCM Reset function. If this code resets after the repairs are made, the PCM has failed.